Wet Bulb Globe Heat Stress Meter with Color Coded DisplayTakes the guesswork out of heat stress calculations. This unique heat stress meter features bright, multicolor LED backlights corresponding to OSHA's heat stress alert levels. This visual alert system (not visible in outdoor daylight), allows management and workers to be instantly aware when the heat index enters potentially dangerous zones. These features, combined with the optional audible alarm help to mitigate the risk of heat related injuries in